<ul class="selectNav">
    <li><a href="<?php echo site_url('admin/dbmanage/export')?>"><span>备份</span></a></li>
    <li><a href="<?php echo site_url('admin/dbmanage/optimize')?>"><span>优化</span></a></li>
    <li><a href="<?php echo site_url('admin/dbmanage/import')?>"><span>恢复</span></a></li>
</ul>